Agnath

//ˈæɡ.nəθ// noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    An agnathan.

    "Evolution of vertebrates was accompanied by a gradual increase in oxygen availability, from the irrespirable atmosphere of the Precambrian to a PO₂ at 7 mmHg with the first vertebrates (agnaths), to the present sea level PO₂ value of 160 mmHg with the first reptiles."

Synonyms

All synonyms
agnathanagnathan

Example

More examples

"Evolution of vertebrates was accompanied by a gradual increase in oxygen availability, from the irrespirable atmosphere of the Precambrian to a PO₂ at 7 mmHg with the first vertebrates (agnaths), to the present sea level PO₂ value of 160 mmHg with the first reptiles."

Etymology

From Agnatha, from Ancient Greek ἀ- (a-, “without”) + γνάθος (gnáthos, “jaw”).

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.